Flag for use with writeToParcel(Parcel, int): the object being written
is a return value, that is the result of a function such as
"Parcelable someFunction()",
"void someFunction(out Parcelable)", or
"void someFunction(inout Parcelable)".

Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object, or
some other thread interrupts the current thread, or a certain
amount of real time has elapsed.

describeContents

Describe the kinds of special objects contained in this Parcelable
instance's marshaled representation. For example, if the object will
include a file descriptor in the output of writeToParcel(Parcel, int),
the return value of this method must include the
CONTENTS_FILE_DESCRIPTOR bit.

Returns

int

a bitmask indicating the set of special object types marshaled
by this Parcelable object instance.